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https://doi.org/10.1351/goldbook.R05163
A substance that is consumed in the course of a chemical reaction. It is sometimes known, especially in the older literature, as a @R05190@, but this term is better used in a more specialized sense as a test substance that is added to a system in order to bring about a reaction or to see whether a reaction occurs (e.g. an analytical @R05190@).
Source:
PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 183 [Terms] [Paper]